Use MongoDB as a single node replica set

We need Mongo working as a RS because of the
change streams functionality which we use for
policy synchronization.

docker-compose.yml

@@ -70,9 +70,16 @@ services:
     environment:
       MONGO_INITDB_ROOT_USERNAME: root
       MONGO_INITDB_ROOT_PASSWORD: root
+      MONGO_REPLICA_SET_NAME: rs0
     ports:
       - "27017:27017"
     volumes:
       - ./mongo/docker-entrypoint-initdb.d/mongo-init.js:/docker-entrypoint-initdb.d/mongo-init.js:ro
       - ./volumes/mongodb:/data/db
+    healthcheck:
+      test: test $$(echo "rs.initiate().ok || rs.status().ok" | mongo -u $${MONGO_INITDB_ROOT_USERNAME} -p $${MONGO_INITDB_ROOT_PASSWORD} --quiet) -eq 1
+      interval: 10s
+      start_period: 30s
+    restart: on-failure
+    command: "--bind_ip_all --replSet rs0"
 

env/policy.env

@@ -9,7 +9,7 @@ REDIS_USER=""
 REDIS_PASS=""
 REDIS_DB=1
 REDIS_EXPIRATION="1h"
-MONGO_ADDR="mongodb://mongo:27017/policy?authSource=admin"
+MONGO_ADDR="mongodb://mongo:27017/policy?replicaSet=rs0&authSource=admin"
 MONGO_USER="root"
 MONGO_PASS="root"
 MONGO_DBNAME="policy"

mongo/docker-entrypoint-initdb.d/mongo-init.js

@@ -15,8 +15,9 @@ db.policies.insertMany(
                 1 == 1
             }
 
-			taskID := "deadbeef"
-        },
+            taskID := "0123456789abcdef"
+            `
+        }
     ]
 );